A suspension control system dynamically adjusts pistons located proximal to wheels of an agricultural machine to substantially equalize distribution of weight of the machine at each wheel and/or provide a substantially constant desired orientation of the machine above a ground surface thereby protecting laterally extending sprayer booms from contacting the ground. Articulation, pitch, roll and/or machine height can be determined from piston measurements on the machine to apply such height corrections. For sprayers, this allows controlling clearance and suspension height to maintain the boom parallel to the ground to prevent damage.

A damper system for a vehicle is provided that includes a pressurized gas damper, electromagnetic actuator, and pressurized gas spring. The pressurized gas damper includes first and second working chambers that are fluidly connected by a flow control orifice. The electromagnetic actuator includes a stator assembly with a stator cavity and a magnetic rotor that is slidingly received in the stator cavity. The magnetic rotor is fixed to a damper tube that houses the second working chamber. The stator cavity and an end of the damper tube cooperate to define the first working chamber. The pressurized gas spring includes a bellows chamber that extends annularly about the damper tube. The damper tube includes an opening between the second working chamber and the bellows chamber.

A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, a ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a ventilation line between the pneumatic main line and the ventilation connection. The ventilation line has a ventilation valve and a ventilation throttle. The compressed-air feed system further includes a bypass line between the compressed-air connection and the air dryer. The bypass line has a bypass valve formed as a 2/2 directional valve configured to permit an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system.

A reciprocating-piston machine includes at least one first cylinder and at least one first piston assigned to the first cylinder as well as at least one second cylinder and at least one second piston assigned to the second cylinder. During operation, the first piston and the second piston are deflected in a respective cylinder displacement chamber of the respective first cylinder and the second cylinder. The reciprocating-piston machine further includes a crankshaft which, during operation, can be driven and which has an eccentric crankshaft journal and a drive shaft coupling designed for the coupling of a drive shaft of a drive motor for driving the crankshaft. Additionally, the reciprocating-piston machine includes a first connecting rod configured to deflect the first piston, a second connecting rod configured to deflect the second piston, and a bearing pin about which the first and second connecting rod are rotationally movable.

A leveling valve (101) for discharging and supplying air from and to a plurality of utilization elements (205a, b), in particular pneumatic suspension bellows, includes a valve arrangement (103) for directing air between a source (207) of pressurized air, an exhaust port (3) and the utilization elements, a supply port (1) in fluid communication with the valve arrangement (103) and the source (207) of pressurized air, and an exhaust port (3) having an exhaust air channel (a) for discharging exhaust air. The exhaust port (3) includes at least one air-permeable damping element, which is at least partly positioned within the exhaust air channel (a).

A leveling valve (101) for discharging and supplying air from and to a plurality of utilization elements (205a,b), in particular pneumatic suspension bellows, includes a valve arrangement (103) for directing air between a source (207) of pressurized air, an exhaust port (3) and the utilization elements (205a,b), and a supply port (1) in fluid communication with the valve arrangement (103) and the source (207) of pressurized air. A check valve (5) is mounted upstream of the valve arrangement (103) and is configured to allow fluid flow from the supply port (1) towards the valve arrangement (103) and to block fluid flow from the valve arrangement (103) through the supply port (1).

A vehicle height adjusting apparatus includes: a cylindrical body internally partitioned into a plurality of oil chambers by a partition wall provided along an axis, the oil chambers filled with oil, and respectively provided with cylindrical body oil holes to be connected to an outside; one operating portion rotatably provided on the cylindrical body, and rotated to be moved along the axis; pistons moved along the axis by the operating portion, and received in the oil chambers respectively; and a plurality of damper devices respectively provided with damper oil holes into which the oil flowing out of the cylindrical body oil holes when the pistons move flows, the damper devices that can adjust a vehicle height by amounts of the oil filled into the damper devices through the damper oil holes, and that can absorb impact energy inputted on a wheel.

A suspension apparatus includes: a damping device; an operating section; and a determination section. The determination section uses a base damping force determined based on a change velocity and an extension occasion adjustment value, or the base damping force, the extension occasion adjustment value and a zero occasion adjustment value to determine a target value of an extension occasion damping force. The determination section uses the base damping force, a compression occasion adjustment value and the zero occasion adjustment value, or the base damping force and the compression occasion adjustment value to determine a target value of an compression occasion damping force. The determination section uses the base damping force and the zero occasion adjustment value to determine a target value of a zero occasion damping force.

A hydraulic drop frame trailer for a tow vehicle, the hydraulic drop frame trailer including a trailer frame having two sides and a hitch, a pair of wheels, a first and second frame bracket, a trailer bed mounted over the trailer frame, a first and second pivoting hydraulic cylinder, a plurality of hydraulic hoses, a first and second pivoting arm, an operating station connected to a power supply, a first and second axle-less wheel mount with independent suspension mechanism mounted to the first and second pivoting arm, and a plurality of safety locks, each securing an arm to the trailer frame for locking each rotating arm to the trailer bed during transport.

In one aspect, a suspension control system is provided for dynamically adjusting pistons located proximal to wheels of an agricultural machine to account for tire deflection or squat with varying loads. Articulation, pitch, roll and/or machine height can be determined from pressure measurements on the machine to apply such tire height corrections. For sprayers, this allows controlling clearance and suspension height to maintain the boom parallel to the ground to prevent damage.